For 1: I'm pretty sure the regular firefox containers are an extension of the Facebook container. As I recall, Firefox first rolled out the Facebook container for Facebook + Instagram, and then later rolled out Multi-account containers which allowed user defined rules for custom containers
For 2: I'm not familiar with Chrome profiles, but Firefox has profiles as well. And with Firefox you can set up different container settings for different profiles. So you can have container settings for a "Home" profile and a separate container settings for a "Work" profile
For 2: I'm not familiar with Chrome profiles, but Firefox has profiles as well. And with Firefox you can set up different container settings for different profiles. So you can have container settings for a "Home" profile and a separate container settings for a "Work" profile